Reverting "Use STL regex instead of boost"
Revert "Use STL regex instead of boost"

This reverts commit 43f3eddebd074a6d92aa47cbcf816c16b3a2cf9c.
Disabled set_comp due to likely a weird gcc bug
Add subfunction ostreamCTableRow for ostreamCTable
Fix initialization bug (score can be negative so init with very_worst_score)
Add commented debug logging for a future deeper best_possible_bscore debugging
Add fill precisision2.ctable to help debug best_possible_bscore